Vulnerability-Lookup

GHSA-86V2-3HVM-7HWW

Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2025-11-26 00:30

Details

In the Linux kernel, the following vulnerability has been resolved:

cifs: Fix oops due to uninitialised variable

Fix smb3_init_transform_rq() to initialise buffer to NULL before calling netfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it is given. Setting it to NULL means it should start a fresh buffer, but the value is currently undefined.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38737"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-05T18:15:43Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix oops due to uninitialised variable\n\nFix smb3_init_transform_rq() to initialise buffer to NULL before calling\nnetfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it\nis given.  Setting it to NULL means it should start a fresh buffer, but the\nvalue is currently undefined.",
  "id": "GHSA-86v2-3hvm-7hww",
  "modified": "2025-11-26T00:30:16Z",
  "published": "2025-09-05T18:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38737"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/453a6d2a68e54a483d67233c6e1e24c4095ee4be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4931fe2dbe1cc0e7d350a4b51b0b330e43971d98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6adaa9fae36f848afa7278945d725e197e33c496"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38737 (GCVE-0-2025-38737)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2026-08-05 12:04

Title

cifs: Fix oops due to uninitialised variable

Summary

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix oops due to uninitialised variable Fix smb3_init_transform_rq() to initialise buffer to NULL before calling netfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it is given. Setting it to NULL means it should start a fresh buffer, but the value is currently undefined.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/4931fe2dbe1cc0e7d…
https://git.kernel.org/stable/c/6adaa9fae36f848af…
https://git.kernel.org/stable/c/453a6d2a68e54a483…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a2906d3316fc19bf0ade84618bb73eab604c447e , < 4931fe2dbe1cc0e7d350a4b51b0b330e43971d98 (git) Affected: a2906d3316fc19bf0ade84618bb73eab604c447e , < 6adaa9fae36f848afa7278945d725e197e33c496 (git) Affected: a2906d3316fc19bf0ade84618bb73eab604c447e , < 453a6d2a68e54a483d67233c6e1e24c4095ee4be (git)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.44 , ≤ 6.12.* (semver) Unaffected: 6.16.4 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4931fe2dbe1cc0e7d350a4b51b0b330e43971d98",
              "status": "affected",
              "version": "a2906d3316fc19bf0ade84618bb73eab604c447e",
              "versionType": "git"
            },
            {
              "lessThan": "6adaa9fae36f848afa7278945d725e197e33c496",
              "status": "affected",
              "version": "a2906d3316fc19bf0ade84618bb73eab604c447e",
              "versionType": "git"
            },
            {
              "lessThan": "453a6d2a68e54a483d67233c6e1e24c4095ee4be",
              "status": "affected",
              "version": "a2906d3316fc19bf0ade84618bb73eab604c447e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.44",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.4",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix oops due to uninitialised variable\n\nFix smb3_init_transform_rq() to initialise buffer to NULL before calling\nnetfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it\nis given.  Setting it to NULL means it should start a fresh buffer, but the\nvalue is currently undefined."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable path is the SMB3 client transport-encryption routine, and whether it is entered is dictated by server-supplied SESSION_SETUP/TREE_CONNECT flags (SMB2_SESSION_FLAG_ENCRYPT_DATA / SHI1005_FLAGS_ENCRYPT_DATA), so a remote or MITM SMB server across the network selects the vulnerable path and receives the leaked plaintext of the corrupted buffer.\nAC:L - Once encryption is negotiated, every write with a payload runs the uninitialised pointer through netfs_alloc_folioq_buffer(); the stack slot is reachable and groomable via ordinary syscall sequences on the writing task\u0027s kernel stack, with no condition outside the attacker\u0027s influence.\nPR:N - The remote SMB server presents no credentials to the client and needs none to set the encryption flags that gate the path; on the local side, any user holding a normal write handle to the mounted share triggers it with no elevated privileges.\nUI:N - An already-mounted share reaches the path through routine writeback and automatic reconnect (which re-runs session setup and tree connect), so no victim action beyond normal use of an existing mount is required.\nS:U - The wild reads, writes and bogus folio_put()s all occur within the kernel\u0027s own memory and the same security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Because *_buffer is never reassigned, the garbage folio_queue is used as the ITER_SOURCE for crypt_message(), so arbitrary kernel memory pointed to by the stale chain is encrypted and sent to the remote peer, and freeing the chain yields further use-after-free read primitives.\nI:H - netfs_alloc_folioq_buffer() writes through the garbage pointer (tail-\u003enext = p, p-\u003eprev = tail, folioq_append_mark()), and cifs_copy_iter_to_folioq() then copies attacker-supplied write() data into folios derived from that chain, giving a content-controlled kernel write suitable for control-flow hijacking.\nA:H - The commit is titled \"Fix oops due to uninitialised variable\" \u2014 dereferencing the indeterminate pointer oopses the kernel, and the resulting folio_queue/folio refcount corruption and bogus frees cause further panics."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:04:26.998Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4931fe2dbe1cc0e7d350a4b51b0b330e43971d98"
        },
        {
          "url": "https://git.kernel.org/stable/c/6adaa9fae36f848afa7278945d725e197e33c496"
        },
        {
          "url": "https://git.kernel.org/stable/c/453a6d2a68e54a483d67233c6e1e24c4095ee4be"
        }
      ],
      "title": "cifs: Fix oops due to uninitialised variable",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38737",
    "datePublished": "2025-09-05T17:20:37.719Z",
    "dateReserved": "2025-04-16T04:51:24.034Z",
    "dateUpdated": "2026-08-05T12:04:26.998Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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